架空输电线感应电压的计算方法研究

发布时间：2018-08-26 08:46

【摘要】：随着经济的发展,社会对电力的需求越来越高,在此背景下,为节约线路走廊、减少城市土地占用同时也节约电力基础建设的开支,高压架空输电线路均采用同塔双回乃至同塔多回的电力传输方式进行电能传输。同塔多回输电技术提高了单位线路的电力传输容量,但同时也带来了一些问题,如:由于电力传输线的高电压等级(220k V、500kV、800k V、1000k V等),在邻近线路上会产生很大的感应电压和感应电流,特别是在其中一回或者几回电路进行停运检修时,它所产生的感应电压和感应电流对检修工作人员来说是一个极大的安全隐患。因此需要对同塔双回、多回架空输电线的感应电压、电流计算方法进行研究,并以此探究如何保障人员安全。本文主要根据架空输电线路的工作特点,首先对架空输电线路中感应电压产生的原理和计算原理进行理论分析;然后阐述了应用于输电线路的感应电压研究的同塔双回架空输电线路模型,并应用EMTP仿真软件对同塔双回架空输电线路感应电压的影响因素,如:线路长度、线路载荷、线路换位方式、并联电抗器情况、土壤电阻率等进行了定量计算和分析;最后根据不同因素同感应电压的影响程度,提出了适用于工程计算的线路感应电压计算方法。本文的研究将对线路的设计以及相关接地开关的选择、保障人员安全有着一定的指导意义。
[Abstract]:With the development of economy, the demand for electric power is increasing. In order to save the corridor, reduce the occupation of urban land and save the expenditure of electric power infrastructure, High-voltage overhead transmission line adopts the same tower double circuit and even the same tower multi-circuit electric power transmission mode to carry on the electric energy transmission. Multi-circuit transmission technology in the same tower improves the transmission capacity of unit lines, but it also brings some problems. For example, because of the high voltage level of the power transmission line (220kV / 500kV / 800kV / 1000kV etc.), large inductive voltage and inductive current will be generated on the adjacent lines, especially when one or more of the circuits are shut down and overhauled. The inductive voltage and current generated by it is a great safety hazard for maintenance workers. Therefore, it is necessary to study the calculation method of inductive voltage and current of double-circuit and multi-circuit overhead transmission lines in the same tower, and to explore how to ensure the safety of personnel. According to the working characteristics of overhead transmission lines, the principle and calculation principle of induction voltage generation in overhead transmission lines are analyzed in this paper. Then the model of the same tower double overhead transmission line applied to the research of the induction voltage of the transmission line is expounded, and the influence factors of the inductive voltage of the same tower double overhead transmission line, such as the line length, the line load, and the simulation software of EMTP, are discussed. The transmission line transposition mode, parallel reactor situation, soil resistivity and so on are calculated and analyzed quantitatively. Finally, according to the influence degree of the same inductive voltage of different factors, the calculation method of line inductive voltage suitable for engineering calculation is put forward. The research in this paper will have certain guiding significance to the design of the line and the selection of the related earthing switch and to ensure the safety of the personnel.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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